time reference scanning beam


time reference scanning beam

[′tīm ‚ref·rəns ′skan·iŋ ‚bēm] (navigation) A radio or radar beam which is swept to and fro over a sector of space and in such a manner that the interval between reception of successive pulses at an aircraft indicates the aircraft's altitude or azimuth. A system of ground equipment that generates such beams at microwave frequencies to furnish guidance to aircraft making microwave landings. Abbreviated TRSB.